What was found
CONT CABIN ZONE TEMP INTERMITTENT LIGHT AFTER START RESETS WITH MASTER CAUTION RESET. GROUNDED - YES. PERFORMED PZTC BITE REF B737-800 FIM 21-62 TASK 801. CONTROLLER 2 FAULTED FLT DECK TRIM VALVE ON BIT AND PREV FLT. FAULT CLEARED WHEN PUSHED VERIFY. GREEN GO LIGHT ILLUMINATED. PERFORMED FLT DECK TEMP SENSOR CLEANING DUE TO DIRTY WITH DUST/ DEBRIS REF B737-800 AMM 21-61-10. OPERATED BOTH PACKS FOR 10 MIN. PERFORMED PZTC BITE AGAIN. NO FAULTS NOTED.